I wasn’t sure which category to place this in but it pertains to embedding twitch on a webpage.
Error while parsing the 'sandbox' attribute: 'allow-storage-access-by-user-activation' is an invalid sandbox flag.
Although this does not seem to affect the functions of the chat, it does show as a pesky error in the console.
See Storage Access API - Web APIs | MDN
Just means your browser doesnt’ understand it (yet) and/or the browsers that do understand it will process it accordingly.
Since it doesn’t effect embed’s operation you can ignore it
Got it, thanks. 
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